Manufacturing method of polymerization grade propylene
I. INTRODUCTION
Propylene is an important chemical raw material widely used in the production of various chemicals such as polymers, alcohols, ethers, aldehydes, ketones and so on. Among them, polymerization grade propylene is the main raw material for the production of polymers such as polypropylene, and its purity and quality have an important impact on the performance of polymers. Therefore, it is of great significance to study the manufacturing method of polymerization grade propylene to improve the quality and yield of polymers such as polypropylene.
II. Manufacturing method of polymerization grade propylene
1. Steam cracking method
Steam cracking method is the main method of producing polymerization grade propylene at present. The method takes naphtha, light diesel oil, liquefied petroleum gas and so on as raw materials, mixes with water vapor under high temperature and high pressure, and enters the cracking furnace to carry out cracking reaction to generate propylene, ethylene and other low-carbon olefins. The cracked gas is cooled, separated and purified to obtain polymerization grade propylene. The advantages of
steam cracking method are wide source of raw materials, mature production process and high product purity. However, the method consumes high energy and produces a large amount of by-products and wastes, causing some pollution to the environment.
2. Catalytic Cracking
Catalytic cracking is a cracking reaction of feedstock oil under the action of a catalyst to produce low carbon olefins such as propylene. Compared with steam cracking, catalytic cracking has lower energy consumption and less waste emission, but the activity and selectivity of the catalyst have a greater impact on product quality.
3. Olefin Disproportionation
Olefin Disproportionation is to disproportionate low carbon olefins (e.g., ethylene, propylene) under the action of a catalyst to produce a mixture of high carbon olefins (e.g., butene, pentene) and low carbon olefins (e.g., ethylene, propylene). By separation and purification, polymerization grade propylene can be obtained.
The advantage of olefin disproportionation method is that low carbon olefin can be used as raw material to produce high value-added polymer products, but the activity and selectivity of the catalyst also have a greater impact on product quality.
III. Optimization of manufacturing process of polymerized grade propylene
In order to improve the quality and yield of polymerized grade propylene, the manufacturing process needs to be optimized. The following are some possible optimization measures:
1. Improve the activity and selectivity of the catalyst to increase the yield and purity of propylene;
2. Optimize the cracking reaction conditions to improve the reaction efficiency and product quality;
3. Strengthen the control and management of the manufacturing process to reduce the fluctuations and errors in the production process;
4. Adopt advanced separation and purification technology to improve the purity and yield of the product.
4. Conclusion
Polymerization grade propylene is an important raw material for the production of polymers such as polypropylene, and its manufacturing methods mainly include steam cracking, catalytic cracking and olefin disproportionation. In order to improve product quality and yield, the manufacturing process needs to be optimized, including the improvement of catalyst activity and selectivity, the optimization of cracking reaction conditions, the enhancement of the control and management of the production process, and the adoption of advanced separation and purification technologies. Through the implementation of these measures, the quality and yield of polymerized grade propylene can be further improved, providing strong support for the development of the polymer industry.
